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Derivative Instruments and Hedging Activities (Narrative) (Details)
MMBbls in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2017
USD ($)
MMBbls
Apr. 30, 2016
USD ($)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 0 $ 0 $ 0
Reclassification of net gain to earnings during next 12 months     $ 5,800,000  
Description of Reclassification of Cash Flow Hedge Gain (Loss)     0  
Number of barrels of propane covered by cash flow hedges | MMBbls     2,300  
Additional Collateral, Aggregate Fair Value 0   $ 0  
Derivative amount of credit risk     7,800,000  
Derivative net liability position aggregate fair value 0   0  
Collateral already posted 0   0  
Gain or loss in earnings related to hedge ineffectiveness     0 0
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges     0 0
Ferrellgas, L.P. [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 0
Reclassification of net gain to earnings during next 12 months     $ 5,800,000  
Description of Reclassification of Cash Flow Hedge Gain (Loss)     0  
Number of barrels of propane covered by cash flow hedges | MMBbls     2,300  
Additional Collateral, Aggregate Fair Value 0   $ 0  
Derivative amount of credit risk     7,800,000  
Derivative net liability position aggregate fair value 0   0  
Collateral already posted 0   0  
Gain or loss in earnings related to hedge ineffectiveness     0 0
Reclassification of gain (loss) to earnings from discontinuance of cash flow hedges     $ 0 0
Diesel fuel [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     36  
Diesel fuel [Member] | Ferrellgas, L.P. [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     36  
Unleaded gasoline [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     7  
Unleaded gasoline [Member] | Ferrellgas, L.P. [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     7  
Crude Oil [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     400  
Crude Oil [Member] | Ferrellgas, L.P. [Member]        
Number of barrels of propane covered by cash flow hedges | MMBbls     400  
Propane commodity derivatives [Member] | Interest Expense [Member] | Ferrellgas, L.P. [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 $ 0 0
Interest Rate Swap [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 0 $ 0 $ 0